Sewage pump/grinder pit question

1056 Views 5 Replies 2 Participants Last post by Rich, Dec 14, 2012

Rich

Discussion Starter · Dec 12, 2012 (Edited by Moderator)

Working on replumbing a 160+ year old house. We're trying to get the waste from a 2nd floor bathroom that previously ran on the outside wall of the house to a separate cesspool than what the rest of the house is attached to, connected to the main line to the septic system that was installed a few years ago.

The general plan is to drop the waste line to the basement (with a box out inside of a room instead of in the wall, unfortunately) and into a sewage pump/grinder pit. There it will be pumped across the basement and tied into the main line.

At least one plumber that I had out before we decided to do ourselves mentioned the possibility of installing the pit above the floor instead of trying to bury it. Mentioned it to the inspector when I walked him through the project and he wasn't against it as long as the manufacture installation directions accounted for such an installation.

Has anyone ever seen or heard of such a pit in use. I'm assuming it would need to be built into a cabinet or otherwise fastened to a wall or other support for stabilization but I think this would be a whole lot easier than trying to break up the concrete in the basement.

Thanks for any suggestions/help.

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TheEplumber

· #2 · Dec 12, 2012

I have installed small units like this and I see no reason larger ones cannot be also. My concern would be that the tank is able to support itself because there is no soil to hold it's shape. I suggest you find a model you're interested in and contact the factory rep and verify that it can be installed as you propose. They may even have engineered drawings that will satisfy your inspector.
You also said the 2nd floor is now going to be piped to the septic- I assume you verified the tank and drain field will support the additional load.

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TheEplumber

· #4 · Dec 13, 2012

All those brands are good. I'd side step the box stores and find a good local pump supplier. They can size properly size the pump based on the criteria you give them. Plus if it fails you know where to get parts.
When all said and done, be sure to collapse and fill the old pool too

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